Influence of Mg doping on structural defects in AlGaN layers grown by metalorganic chemical vapor deposition

2001 ◽  
Vol 79 (23) ◽  
pp. 3788-3790 ◽  
Author(s):  
Hyung Koun Cho ◽  
Jeong Yong Lee ◽  
Seong Ran Jeon ◽  
Gye Mo Yang
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Metalorganic Chemical Vapor Deposition ◽  
Chemical Vapor ◽  
Structural Defects ◽  
Mg Doping ◽  
Metalorganic Chemical

Development of Homoepitaxially Grown GaN Thin Film Layers on Freestanding Bulk m-plane Substrates by Metalorganic Chemical Vapor Deposition (MOCVD)

2007 ◽  
Vol 1040 ◽  
Author(s):  
Vibhu Jindal ◽  
James Grandusky ◽  
Neeraj Tripathi ◽  
Mihir Tungare ◽  
Fatemeh Shahedipour-Sandvik ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Growth Rates ◽  
Vapor Deposition ◽  
Metalorganic Chemical Vapor Deposition ◽  
Chemical Vapor ◽  
Growth Conditions ◽  
Structural Defects ◽  
Lateral Growth ◽  
High Quality ◽  
Metalorganic Chemical

AbstractHigh quality homoepitaxial growth of m-plane GaN films on freestanding m-plane HVPE GaN substrates has been performed using metalorganic chemical vapor deposition. For this a large growth space was studied. Large areas of no-nucleation along with presence of high density of defects were observed when layers were grown under growth conditions for c-plane GaN. It is believed that these structural defects were in large part due to the low lateral growth rates as well as unequal lateral growth rates in a- and c- crystallographic directions. To achieve high quality, fully coalesced epitaxial layers, growth conditions were optimized with respect to growth temperature, V/III ratios and reactor pressure. Higher growth temperatures led to smoother surfaces due to increased surface diffusion of adatoms. Overall, growth at higher temperature and lower V/III ratio decreased the surface roughness and resulted in better optical properties as observed by photoluminescence. Although optimization resulted in highly smooth layers, some macroscopic defects were still observed on the epi-surface as a result of contamination and subsurface damage remaining on bulk substrates possibly due to polishing. Addition of a step involving annealing of the bulk substrate under H2: N2 environment, prior to growth, drastically reduced such macroscopic defects.

scholarly journals SURFACE CHEMICAL STATES OF HETEROEPITAXIAL NITRIDE FILMS ON SAPPHIRE BY METALORGANIC CHEMICAL VAPOR DEPOSITION

2004 ◽  
Vol 03 (04n05) ◽  
pp. 655-661 ◽  
Author(s):  
K. LI ◽  
Z. C. FENG ◽  
C.-C. YANG ◽  
J. LIN
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Metalorganic Chemical Vapor Deposition ◽  
Surface Segregation ◽  
Chemical Vapor ◽  
Aluminum Surface ◽  
Surface Chemical ◽  
Mg Doping ◽  
Chemical States ◽  
Metalorganic Chemical

Surface chemical states of GaN , AlGaN and InGaN by metalorganic chemical vapor deposition, and the influence of different dopants are studied with X-ray Photoelectron Spectroscopy (XPS). The results show that for most of the samples the N 1s peak can be fitted with a dominant GaN peak and a small N – H peak, while Ga 3d can be deconvoluted into three peaks from elemental Ga , GaN and Ga 2 O 3. Si -doping appears to have small influence on the surface chemical states of GaN while the influence of Mg -doping appears larger. In addition to a change in the component intensities, Mg -doping also causes the N 1s and Ga 3d peaks to broaden. The ternary AlGaN sample shows aluminum surface segregation, while the undoped InGaN shows indium surface deficiency.

Metalorganic Chemical Vapor Deposition of Non-polar III-Nitride Films over a-plane SiC Substrates

2004 ◽  
Vol 831 ◽  
Author(s):  
Jiawei Li ◽  
Zheng Gong ◽  
Changqing Chen ◽  
Vinod Adivarahan ◽  
Mikhail Gaevski ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
High Performance ◽  
Metalorganic Chemical Vapor Deposition ◽  
Chemical Vapor ◽  
Building Blocks ◽  
Optical Quality ◽  
Structural Defects ◽  
Structural Quality ◽  
Metalorganic Chemical

ABSTRACTWe report progress in growing non-polar a-plane III-nitride films and heterostructures over a-plane 4H-SiC. a-plane SiC is more closely lattice-matched to a-plane GaN than is r-plane sapphire. Consequently, better structural quality a-plane nitride films may result over a-plane SiC substrates. By migration enhanced metalorganic chemical vapor deposition (MEMOCVD), an atomically smooth (1120)AlN layer with RMS roughness of 0.3nm was obtained. From the results of XRD, the structural defects in the AlN layer on SiC substrates were strongly reduced compared to those grown on r-plane sapphire. Also by applying our selective area lateral epitaxy (SALE) growth procedure, we achieved high structural and optical quality a-plane GaN films on 4H-SiC with RMS roughness only 0.4nm. Therefore, non-polar III-nitride films and heterostructures on SiC substrates are promising building blocks for realizing high performance polarization-free devices.

scholarly journals Metalorganic chemical vapor deposition of InN quantum dots and nanostructures

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Caroline E. Reilly ◽  
Stacia Keller ◽  
Shuji Nakamura ◽  
Steven P. DenBaars
Keyword(s):  
Quantum Dots ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Metalorganic Chemical Vapor Deposition ◽  
Near Infrared ◽  
Optoelectronic Devices ◽  
Chemical Vapor ◽  
Electromagnetic Spectrum ◽  
Material System ◽  
Metalorganic Chemical

AbstractUsing one material system from the near infrared into the ultraviolet is an attractive goal, and may be achieved with (In,Al,Ga)N. This III-N material system, famous for enabling blue and white solid-state lighting, has been pushing towards longer wavelengths in more recent years. With a bandgap of about 0.7 eV, InN can emit light in the near infrared, potentially overlapping with the part of the electromagnetic spectrum currently dominated by III-As and III-P technology. As has been the case in these other III–V material systems, nanostructures such as quantum dots and quantum dashes provide additional benefits towards optoelectronic devices. In the case of InN, these nanostructures have been in the development stage for some time, with more recent developments allowing for InN quantum dots and dashes to be incorporated into larger device structures. This review will detail the current state of metalorganic chemical vapor deposition of InN nanostructures, focusing on how precursor choices, crystallographic orientation, and other growth parameters affect the deposition. The optical properties of InN nanostructures will also be assessed, with an eye towards the fabrication of optoelectronic devices such as light-emitting diodes, laser diodes, and photodetectors.

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